Safety-burner.



E. ROTH. SAFETY BURNER.

APPLICATION IILIID MAY 7, 1908.

.Patented July 5, 1910.

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i E. /ml7/%( 7H2 NORRIS PETERS co. WASHINGTON, n. c.

EUGEN ROTH, or sonoivnianne, NEAR BERLIN, GERMANY.

SAFETY-BURNER.

Specification of Letters Patent.

Patented July 5, 1910.

Application filed May 7, 1908. Serial No. 431,332.

To all whom it may concern:

Be it known that I, EUGEN Ro'rI-r, a citizen of the German Empire, andresident of Schoneberg, near Berlin, Germany, manufacturer, haveinvented certain new and useful Improvements in Safety-Burners, of whichthe following is a specification.

This invention relates to safety burners, that is to say to burners inwhich the gas supply is automatically cut off after the flame fed by thelatter is extinguished. The

burner is of that kind in which the closing of the gas valve is effectedby the difference of heat expansion of two bodies.

The object of this invention is to insure permanent reliable working ofthe burner and to remove the disturbance which in well knownconstructions takes place owing to the dimensions of the heat expansionbodies changing during the working. According to this invention, thesaid object is attained by giving to the valve controlling body such aclearance that it can at any moment adapt its position to the size ofthe heat expansion body without any idle working having to be overcomeduring the movement of the valve controlling body for the single starting of the burner, as is the case in well known devices, moreparticularly in those in which adaption to the changing dimensions ofthe expansion bodies is sought by inserting spring controlled parts.

Contrary to that which is the case in previously proposed devices withspring controlled elements, the valve controlling part in theconstruction according to this invention is arranged in an adjustablemanner between stops and mounted to engage its support by friction.

A construction according to this invention applied to an incandescentgas burner is illustrated by way of example in the accompanying drawing.

Figure l is a vertical section through a burner made in accordance withmy invention. Fig. 2 shows likewise in vertical section an alternateconstruction of the burner.

The gas supply branch is marked 1. It is provided at the top with ascrewed 0n caplike part 2, which carries the nozzle 3 with the mixingpipe 4. On the mixing pipe 4 is mounted in well known manner the burnerpipe 5 proper.

On the mouth of the branch 1 is mounted a plate valve 6 forming the mainvalve for automatically shutting off the supply of gas to the burner onextinguishing the burnerfiame. The branch 1 is provided with a cock 7passing through its wall and provided with a handle 8. The cock isprovided with a longitudinal groove 9 which can be brought intocommunication with a perforation or by-passage 10 for the gas in thewall of the branch 1, the said passage opening into the recess of thecap 2. A s ring 11 has the tendency to keep the cock? permanently in aposition in which the groove 9 is situated laterally of the perforation10, so that the gas in passing through the groove 9, cannot get into therecess of the cap 2 through the perforation 10.

The cap 2 is connected by means of perforations 12 to the interior ofthe nozzle, and provided with a tubular heat expansion body 13, theinner hollow space of which is in communication with the hollow space ofthe cap 2. The heat expansion body 13 is connected at the top to a bar14 which has property.

preferably a smaller expanding than the expansion body 13. The rod 14carries at its lower end a sleeve 15 provided with a head 16 projectinginto the hollow space of the cap 2. A certain amount of friction ispresent between the sleeve 15 and the rod 14. The heat expansion body 13projects centrally through the burner head into a carrier 17 for themantle support. 'llhe mantle fork is marked 18, and the mant e 19.

The working of the above described device is as follows: When itisdesired to start the burner, gas is first supplied to the burnerthrough the groove 9 of the cock 7 and the perforation or by-passage 10,which is effected by turning the handle 8 in opposition to the action ofthe spring 11. As soon as the gas supplied in that way to the burner hasbeen lighted, the heat expansion body 13 is heated, which results in theraising of the rod 14, which, owing to its connection with the heatexpansion body 13 at the upper part of the latter, participates in theexpansion movement of the tubular body 13. The extent to which the rod14 is thus raised, depends on the difference of the heat expansionbetween the tubular body 13 and the rod 14. Owing to the raising of therod 14, the head 16 of the sleeve 15 which engages the rod with frictionis lifted off the main valve 6. The valve 6 can, therefore, open underthe pressure of the gas in the gas supply branch, so that the gas canpass to the burner in the normal way through the .perforation 12 in thecap 2. The raising of the head 16 is limited by the upper wall of thecap 2. lVhen the burner is extinguished, the head 16 is lowered, andthus the valve 6 closed, owin to the cooling of the heat expansionbodies 13 and 14. The said closing can only be counteracted by againlightingthe gas.

Owing ;to the adjustable arrangement of the sleeve 15 with the head 16,no disturbance of the working by the change in the dimensions of theexpansion bodies 13, 14 can take place. Assuming that the-expansionbody13 becomes lengthened after acertain period of time, the result will besimply that the rod 1 1 will be pulled out fromithe in such mannerthatthe sleeve shifts on the rod supporting it, while the extent of theo )enin 'movement of the valve closin head,

16 always remains the same. That move ment on which depends the openingor the; closing of the valve takes place in the firstf stage both of theheating and of the cooling of the heat expansion bodies. The idleimovement of the valve controlling part for:

equalizing the .changes in the heat expan-I s1on bodies takes place onlywhen the burner has started working properly.

The modified burner construction 1llustrated-in Fig. 2 is distinguishedfrom that.

:of Fig. 1 substantially only in this respect that it is provided with alighting burner. This modified construction is especially used if it isintended to light the gas by a self lightingdevice. Those parts of-theburner of Fig. 2 which are also found in the construction of Fig. 1 aredesignated with the same reference numerals. Mounted on the casingofvalve 7 is a carrier 20 fora lightingburner, such carrier beingprovided with a bore 21 which is adapted to .communicate with the groove9 of valve 7 in the same manner as the perforation or lay-passage 10 andforming alsoa by-pa-ssage for the gas. Inserted into the-bore 21 is theburner tube 22 of the lighting burner, such burner tube being-shown asprovided with a self lighting device 23. No separate carrier 17 for themantle support is shown in connection with the modified construction ofFig. .2.

The operation of the modified constructionof Fig.2 is as follows:Onopening cock 7 gas is supplied at the same time to the main burnerthrouglr perforation 10 and to the lighting burner through perforation21. The; gas leaving theilighting burner tube 22 is lighted by the selflighting device 23 and the flame of the lighting burner lights the mainburner. The so produced initial flame of the main burner'heats the valveopening device in the same way as previously described and produces anopening of valve 6.

The valve controlling device of this invention may be used in connectionwith any kind of burner for lighting or heating purposes. It is also notessential that the heat expansion bodies should be arranged centrallyrelatively to the burner or centrally relatively to each other. Theclosing valve could also be directly connected with the adjustablesleeve but this arrangement would be less advantageous:as in that case adisturbance of the reliable closing ofthe valve would take place moreeasily should the valve carrier become'bent by outside forces.

Having now particularly described and ascertained the nature of my saidinvention, and in what manner the same is to be performed, I declarethat what I claim is:

1. In a safety burnera valve and a thermostatic operating device forsame, said thermostatic operating device comprising two parts in slidingand frictional contact with each other and one of same in directoperative connection with said valve and adapted to be moved by heataction only within certain limits said valve comprising means limitingthe movement of the valve in both directions.

2. In a safety burner a valveand a thermostatic operating device forsame said thermostatic operating device comprisingtwo parts in slidingand frictional contact with each other and one ofsame contacting withsaid valve andadapted to be :moved by heat actiononly within certainlimitssaid valve comprising means limiting the movement of the valve inboth directions.

3. In a safety burner a valve and a thermostatic operating device forsame, said thermostatic operating device comprising a bar, a valveactuating body frictionallysliding on said bar, and contactingwith saidvalve and adapted to be moved only within certain limits, a carrier :forsaid bar, the bar being connected to said carrier at a distance fromsaid sliding valve actuating body said valve comprising means limitingthe movement of the valve in both directions.

4:.In an incandescent safety burner a valve and a thermostatic operatingdevice for same, said thermostatic operating device comprising a bararra nged centrally to the mixing tube of the burner, a valve actuatingbody sliding on and in frictional contact with said bar, a carrier forsaid bar;adapted to be heated by the burner flame, :tlievalve actuatingbody adaptedzto be movedloy said carrying bar only within certain:limitssaid valve comprising means limiting the movement of the valve-inboth directions.

5. In an incandescent safety burner .a

valve and a thermostatic operating device for same, said thermostaticoperating device comprising a bar arranged centrally to the mixing tubeof the burner, a valve actuating body sliding on and in frictionalcontact with said bar, a carrier for said bar adapted to be heated bythe burner flame, the valve actuating body adapted to be moved by saidcarryin bar only within certain limits and contacting with said valvesaid valve comprising means limiting the movement of the valve in bothdirections.

6. In an incandescent safety burner a main valve, a thermostaticoperating device for same comprising a bar arranged centrally to themixing tube of the burner, a sliding member and in frictional contactwith said bar said sliding member in direct operative connection withsaid main valve and adapted to be moved-by heat action only withincertain limits, an auxiliary valve, a by-passage for the gas controlledby said auxiliary valve and hand operatable automatic means for keepingsaid by-passage normally closed by said auxiliary valve said valvecomprising means limiting the movement of the valve in both directions.

7. In a safety burner a valve, a thermostatic operating device for samecomprising two parts in sliding and frictional contact with each otherand one of same in direct operative connection with said valve andadapted to be moved by heat action only within certain limits, and aby-passage for the gas adapted to cooperate with a gasselflightingdevice said valve comprising means limiting the movement ofthe valve in both directions.

8. In a safety burner a valve, a thermostatic operating device for samecomprising two parts in sliding and frictional contact with each otherand one of same in direct operative connection with said valve andadapted to be moved by heat action only within certain limits, tw'oby-passages for the gas, one leading to the burner proper and the othercooperating with a gas selflighting device and an auxiliary valvecontrolling said two by-passages for the gas, and hand operatableautomatic means for keeping said two by-passages normally closed by saidauxiliary valve said valve comprising means limiting the movement of thevalve in both directions.

In testimony whereof I have signed this specification in the presence oftwo subscribing witnesses.

EUGEN ROTH.

Witnesses WOLDEMAR HAUPT, HENRY HASPER.

